Electrical connection device for PCS and distribution box in energy storage cabinet

Abstract

The utility model belongs to the technical field of energy storage cabinets, and relates to an electric connection device of a PCS and a distribution box in an energy storage cabinet, which comprises an energy storage cabinet, a distribution box, a PSC, a direct current positive pole bar, a direct current negative pole bar, an alternating current U bar, an alternating current V bar, an alternating current W bar and an alternating current N. All conductive copper bars are sequentially and conductively connected with corresponding wiring terminals of the distribution box and the PSC according to the installation sequence from inside to outside and from short to long. According to the utility model, soft copper bar conductive connection is adopted to replace a mode that a large-wire-diameter cable is bent, arranged and routed in a narrow space before and after a distribution box and a PSC in an energy storage cabinet, so that installation and maintenance personnel can easily realize current communication among wiring terminals, the installation difficulty is reduced, the installation and maintenance efficiency is improved, and the installation and maintenance cost is reduced. And moreover, the current communication among the wiring terminals is safer and more reliable, the installation time is saved, the installation cost is reduced, the installation reject ratio is reduced, and the PCS heat dissipation effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage cabinets and relates to an electrical connection device between a PCS and a distribution box in an energy storage cabinet. Background Art

[0002] Energy storage cabinets are devices specially designed for storing electrical energy. They have a wide range of application scenarios and play an important role in power systems, renewable energy utilization, home backup power supplies, and specific industry applications. Energy storage cabinets are of great significance to improving energy utilization efficiency, promoting the popularization of renewable energy, and enhancing the flexibility and reliability of power systems through their high-efficiency energy storage and release capabilities. The PCS box in the energy storage cabinet refers to the "power conversion system", which is a key component in the electrochemical energy storage system. The PCS box is responsible for realizing the bidirectional conversion of electrical energy, that is, it can control the charging and discharging process of the energy storage battery pack and convert AC and DC in these two directions. Specifically, when the battery pack needs to be charged, the PCS box converts the AC power from the grid or other power sources into DC power for battery storage; and when the battery pack discharges to power the grid or load, it converts the DC power released by the battery back into AC power. The PCS box ensures the efficient flow and control of electrical energy, can directly power AC loads without a grid, and is a bridge connecting the battery system and the grid (or load). It usually includes a bidirectional converter, a control unit, a protection mechanism, and an interface for communicating with a battery management system (BMS) and an energy management system (EMS) to achieve intelligent management and optimize operation strategies. In modern energy storage systems, the technical performance of PCS has an important impact on the efficiency, safety, and economy of the entire system.

[0003] However, due to the large current carrying capacity of the connecting cable between the PCS and the distribution box in the energy storage cabinet, the connecting cable is usually selected with a wire diameter of 50 square or more. The large-diameter cable has the following defects when connecting and routing in a cabinet with a small space: First, the bending radius is large: due to the thick wire diameter, a distance of 50-60mm is required at the bending point of the routing. Secondly, it is difficult to install in a narrow space: affected by the bending radius, installation in a narrow cabinet space is hindered by the yield stress of the cable, which makes installation difficult and inefficient. Thirdly, it wastes materials: when turning, due to the large bending radius, a longer length than the actual distance is required. Finally, it affects the heat dissipation effect of the PCS and the life of the cable: due to the small area behind the PCS and the large bending radius of the cable, the cable will block the air outlet of the PCS after installation, affecting the heat dissipation effect; at the same time, due to the high air outlet temperature of the PCS, the cable insulation is directly blown by hot air for a long time, affecting the safe service life of the cable, and there are safety hazards in long-term use.

[0004] Therefore, an electrical connection device between a PCS and a distribution box which is easy to install and maintain and safe and reliable for long-term use is needed to solve the above technical problems. Utility Model Content

[0005] The technical solution adopted by the utility model to solve the technical problem is: an electrical connection device between a PCS and a distribution box in an energy storage cabinet, comprising: an energy storage cabinet, a distribution box, and a PSC. The distribution box and the PSC are respectively arranged in the energy storage cabinet, and a DC positive pole row, a DC negative pole row, an AC U pole row, an AC V pole row, an AC W pole row, and an AC N pole row are also arranged in the energy storage cabinet. The DC positive pole row, the DC negative pole row, the AC U pole row, the AC V pole row, the AC W pole row, and the AC N pole row are all long strip-shaped conductive copper poles with rectangular cross sections, and the current flux of the conductive copper poles is greater than the maximum rated current value of the corresponding wiring terminals;

[0006] The DC positive pole row, DC negative pole row, AC U pole row, AC V pole row, AC W pole row, and AC N pole row are connected to the corresponding terminals of the distribution box and PSC in the order of installation from inside to outside and from short to long. The installation order of conductive connection includes: AC N pole row, AC W pole row, AC V pole row, AC U pole row, DC negative pole row, and DC positive pole row are connected in sequence;

[0007] A supporting isolation frame made of epoxy glass fiber board is provided between the DC positive pole row, DC negative pole row, AC U pole row, AC V pole row, AC W pole row and AC N pole row, and the supporting isolation frame supports and fixes the DC positive pole row, DC negative pole row, AC U pole row, AC V pole row, AC W pole row and AC N pole row and electrically insulates them from each other.

[0008] Preferably, the DC positive electrode bar, DC negative electrode bar, AC U bar, AC V bar, AC W bar, and AC N bar are all soft copper bars.

[0009] Preferably, both ends of the DC positive electrode row, DC negative electrode row, AC U row, AC V row, AC W row, and AC N row are respectively provided with mounting holes, and the DC positive electrode row, DC negative electrode row, AC U row, AC V row, AC W row, and AC N row are respectively bolted to the corresponding wiring terminals of the distribution box and the PSC through the mounting holes at both ends to form respective current paths.

[0010] More preferably, the DC positive row, DC negative row, AC U row, AC V row, AC W row, and AC N row are divided into three layers from the inside to the outside, the innermost layer being the AC N row and the AC W row, the middle layer being the AC V row and the AC U row, and the outermost layer being the DC negative row and the DC positive row; the AC N row is located in the upper row of the innermost layer after being bent upward, and the AC W row is located in the lower row of the innermost layer after being bent downward; the AC V row is located in the upper row of the middle layer after being bent upward, and the AC U row is located in the lower row in the middle layer after being bent downward; the DC negative row is located in the upper row of the outermost layer after being bent upward, and the DC positive row is located in the lower row of the outermost layer after being bent downward.

[0011] Preferably, the distribution box is adjacent to the PSC on the left and right and is located on the same layer of the energy storage cabinet.

[0012] More preferably, the distribution box and PSC are located at the bottom layer of the energy storage cabinet.

[0013] Preferably, a lifting ring is provided on the top of the energy storage cabinet, and a base frame is provided on the bottom of the energy storage cabinet.

[0014] Preferably, the outer layers of the DC positive electrode row, the DC negative electrode row, the AC U row, the AC V row, the AC W row, and the AC N row are respectively wrapped with insulating sleeves.

[0015] The beneficial effects of the utility model are:

[0016] 1. The utility model adopts soft copper busbar conductive connection to replace the bending layout and routing of large-diameter cables in the narrow space before and after the distribution box and PSC in the energy storage cabinet, so that installation and maintenance personnel can easily achieve current connection between the terminals, reduce the installation difficulty, improve the efficiency of installation and maintenance, and ensure that the current connection between the terminals is safer and more reliable. Therefore, the utility model saves installation time, reduces installation costs, reduces the installation defect rate, and improves the heat dissipation effect of PCS.

[0017] 2. The utility model connects the wiring terminals by using soft copper bars in the order of inner bars first and outer bars second, short-distance conductive copper bars first and long-distance conductive copper bars, so as to avoid crossing and interference between the conductive copper bars and ensure reasonable spacing and position relationship between the conductive copper bars, so as to make the circuit connection safer and more reliable; at the same time, the neatly arranged conductive copper bars make the energy storage cabinet more maintainable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the copper busbar connection assembly of the electrical connection device between the PCS and the distribution box in the energy storage cabinet;

[0019] Figure 2 This is a partial schematic diagram of the energy storage cabinet installation;

[0020] Figure 3 This is a schematic diagram of the energy storage cabinet installed as a whole;

[0021] Figure 4 This is a top view of the copper busbar connection assembly;

[0022] Figure 5 This is a schematic diagram of copper busbar connection.

[0023] Among them, 1. Energy storage cabinet; 2. Distribution box; 3. PSC; 4. DC positive pole row; 5. DC negative pole row; 6. AC U pole row; 7. AC V pole row; 8. AC W pole row; 9. AC N pole row; 10. Support isolation frame; 11. Lifting ring; 12. Base frame. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the relevant technologies in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] like Figures 1 to 5 As shown, an electrical connection device between a PCS and a distribution box in an energy storage cabinet comprises: an energy storage cabinet 1, a distribution box 2, and a PSC 3. The distribution box 2 and the PSC 3 are respectively arranged in the energy storage cabinet 1. The energy storage cabinet 1 is also provided with a DC positive pole bar 4, a DC negative pole bar 5, an AC U pole bar 6, an AC V pole bar 7, an AC W pole bar 8, and an AC N pole bar 9. The DC positive pole bar 4, the DC negative pole bar 5, the AC U pole bar 6, the AC V pole bar 7, the AC W pole bar 8, and the AC N pole bar 9 are all long strip-shaped conductive copper bars with rectangular cross-sections, and the current flux of the conductive copper bars is greater than the maximum rated current value of the corresponding terminal. The conductive copper bars with pre-bent shapes and sizes according to the spacing and positions of the terminal blocks are replaced by large-diameter cables and bent and routed on-site in the narrow space before and after the distribution box 2 and the PSC 3 of the energy storage cabinet 1, so that the installation and maintenance personnel can easily realize the current connection between the terminals, thereby reducing the difficulty of installation, improving the efficiency of installation and maintenance, and ensuring that the current connection between the terminals is safer and more reliable.

[0026] The DC positive pole row 4, DC negative pole row 5, AC U pole row 6, AC V pole row 7, AC W pole row 8, and AC N pole row 9 are connected to the corresponding terminals of the distribution box 2 and the PSC 3 in the order of installation from inside to outside and from short to long. The installation order of conductive connection includes: AC N pole row 9, AC W pole row 8, AC V pole row 7, AC U pole row 6, DC negative pole row 5, and DC positive pole row 4 are connected in sequence; the terminals are connected in the order of first inner row and then outer row, first short-distance conductive copper row and then long-distance conductive copper row, so that the conductive copper rows avoid crossing and interference, and ensure the reasonable spacing and position relationship between the conductive copper rows, so that the circuit connection is safer and more reliable. At the same time, the neatly arranged conductive copper rows make the energy storage cabinet 1 more maintainable;

[0027] A supporting isolation frame 10 made of epoxy glass fiber board is provided between the DC positive electrode row 4, the DC negative electrode row 5, the AC U row 6, the AC V row 7, the AC W row 8, and the AC N row 9. The supporting isolation frame 10 supports and fixes the DC positive electrode row 4, the DC negative electrode row 5, the AC U row 6, the AC V row 7, the AC W row 8, and the AC N row 9 and electrically insulates and isolates them from each other; the supporting isolation frame 10 is used to support, fix and insulate the conductive copper busbars to prevent short circuits between the conductive copper busbars of different wiring terminals.

[0028] Furthermore, the DC positive electrode bus 4, DC negative electrode bus 5, AC U bus 6, AC V bus 7, AC W bus 8, and AC N bus 9 are all soft copper busbars; the soft copper busbar is mainly formed by stacking multiple layers of thin copper foil and processing through welding, and the middle part remains in a scattered copper sheet state, has excellent electrical conductivity and rapid heat dissipation capability, and has good bendability and easy installation. The soft copper busbar is used on the wiring terminals of the distribution box 2 and the PSC 3 to ensure efficient and safe conductive connection inside the energy storage cabinet 1; the soft copper busbar ensures the stability and safety of the electrical connection between the distribution box 2 and the PSC 3 while maintaining its softness.

[0029] Furthermore, mounting holes are respectively provided at both ends of the DC positive electrode bar 4, the DC negative electrode bar 5, the AC U bar 6, the AC V bar 7, the AC W bar 8, and the AC N bar 9. The DC positive electrode bar 4, the DC negative electrode bar 5, the AC U bar 6, the AC V bar 7, the AC W bar 8, and the AC N bar 9 are respectively bolted to the corresponding terminals of the distribution box 2 and the PSC 3 through the mounting holes at both ends to form respective current paths; the bolt connection or threaded connection makes the electrical connection between the two ends of the conductive copper bar and the terminal more firm and reliable.

[0030] Furthermore, the DC positive electrode row 4, DC negative electrode row 5, AC U row 6, AC V row 7, AC W row 8, and AC N row 9 are divided into three layers from the inside to the outside, the innermost layer is AC N row 9 and AC W row 8, the middle layer is AC V row 7 and AC U row 6, and the outermost layer is DC negative electrode row 5 and DC positive electrode row 4; AC N row 9 is located in the upper row of the innermost layer after being bent upward, and AC W row 8 is located in the lower row of the innermost layer after being bent downward; AC V row 7 is located in the upper row of the middle layer after being bent upward, and AC U row 6 is located in the lower row in the middle after being bent downward; DC negative electrode row 5 is located in the upper row of the outermost layer after being bent upward, and DC positive electrode row 4 is located in the lower row of the outermost layer after being bent downward; the spatial distribution of multiple rows and multiple layers is fully utilized to evenly disperse the conductive copper bars, thereby ensuring the safe spacing between the conductive copper bars and making full use of the narrow space before and after the distribution box 2 and the PSC 3.

[0031] Furthermore, the distribution box 2 and the PSC 3 are adjacent to each other on the left and right and are located on the same layer of the energy storage cabinet 1; the adjacent same-layer layout can reduce the length of the conductive copper bus as much as possible, making wiring more convenient and the wiring path shorter.

[0032] Furthermore, the distribution box 2 and the PSC 3 are located at the bottom layer of the energy storage cabinet 1 .

[0033] Furthermore, a lifting ring 11 is provided at the top of the energy storage cabinet 1 , and a base frame 12 is provided at the bottom of the energy storage cabinet 1 .

[0034] Furthermore, the outer layers of the DC positive electrode bar 4, DC negative electrode bar 5, AC U bar 6, AC V bar 7, AC W bar 8, and AC N bar 9 are respectively wrapped with insulating sleeves; the insulating sleeves outside the conductive copper bars can enhance the insulation between the conductive copper bars, making installation, operation, and maintenance safer.

[0035] In summary, the utility model adopts soft copper busbar conductive connection to replace the bending layout and routing of large-diameter cables in the narrow space before and after the distribution box and PSC in the energy storage cabinet, so that installation and maintenance personnel can easily achieve current connectivity between the terminals, reduce the installation difficulty, improve the efficiency of installation and maintenance, and ensure that the current connectivity between the terminals is safer and more reliable; the utility model saves installation time, reduces installation costs, reduces the installation defect rate, and improves the heat dissipation effect of PCS, so it has broad application prospects.

[0036] It should be emphasized that the above are only preferred embodiments of the present invention and do not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An electrical connection device between a PCS and a distribution box in an energy storage cabinet, characterized in that: include: An energy storage cabinet (1), a distribution box (2), and a PSC (3), wherein the distribution box (2) and the PSC (3) are respectively arranged in the energy storage cabinet (1), and the energy storage cabinet (1) is also provided with a DC positive electrode bar (4), a DC negative electrode bar (5), an AC U bar (6), an AC V bar (7), an AC W bar (8), and an AC N bar (9), wherein the DC positive electrode bar (4), the DC negative electrode bar (5), the AC U bar (6), the AC V bar (7), the AC W bar (8), and the AC N bar (9) are all long strip-shaped conductive copper bars with rectangular cross-sections, and the current flux of the conductive copper bars is greater than the maximum rated current value of the corresponding wiring terminals; The DC positive electrode row (4), the DC negative electrode row (5), the AC U row (6), the AC V row (7), the AC W row (8), and the AC N row (9) are electrically connected to the corresponding connection terminals of the distribution box (2) and the PSC (3) in order of installation from inside to outside and from short to long. The installation order of the electrically conductive connection includes: the AC N row (9), the AC W row (8), the AC V row (7), the AC U row (6), the DC negative electrode row (5), and the DC positive electrode row (4) are electrically connected in order; A supporting isolation frame (10) made of epoxy glass fiber board is provided between the DC positive electrode row (4), the DC negative electrode row (5), the AC U row (6), the AC V row (7), the AC W row (8), and the AC N row (9). The supporting isolation frame (10) supports and fixes the DC positive electrode row (4), the DC negative electrode row (5), the AC U row (6), the AC V row (7), the AC W row (8), and the AC N row (9) and electrically insulates and isolates them from each other.

2. The electrical connection device between the PCS and the distribution box in the energy storage cabinet according to claim 1 is characterized in that: The DC positive electrode row (4), the DC negative electrode row (5), the AC U row (6), the AC V row (7), the AC W row (8), and the AC N row (9) are all soft copper rows.

3. The electrical connection device between the PCS and the distribution box in the energy storage cabinet according to claim 1 is characterized in that: The DC positive electrode row (4), the DC negative electrode row (5), the AC U row (6), the AC V row (7), the AC W row (8), and the AC N row (9) are respectively provided with mounting holes at both ends. The DC positive electrode row (4), the DC negative electrode row (5), the AC U row (6), the AC V row (7), the AC W row (8), and the AC N row (9) are respectively bolted to corresponding wiring terminals of the distribution box (2) and the PSC (3) through the mounting holes at both ends to form respective current paths.

4. The electrical connection device between the PCS and the distribution box in the energy storage cabinet according to claim 3 is characterized in that: The DC positive electrode row (4), the DC negative electrode row (5), the AC U row (6), the AC V row (7), the AC W row (8), and the AC N row (9) are divided into three layers from the inside to the outside, the innermost layer is the AC N row (9) and the AC W row (8), the middle layer is the AC V row (7) and the AC U row (6), and the outermost layer is the DC negative electrode row (5) and the DC positive electrode row (4); the AC N row (9) is located in the upper row of the innermost layer after being bent upwards, and the AC W row (8) is located in the lower row of the innermost layer after being bent downwards; the AC V row (7) is located in the upper row of the middle layer after being bent upwards, and the AC U row (6) is located in the lower row of the middle layer after being bent downwards; the DC negative electrode row (5) is located in the upper row of the outermost layer after being bent upwards, and the DC positive electrode row (4) is located in the lower row of the outermost layer after being bent downwards.

5. The electrical connection device between the PCS and the distribution box in the energy storage cabinet according to claim 1 is characterized in that: The distribution box (2) and the PSC (3) are adjacent to each other on the left and right and are located on the same layer of the energy storage cabinet (1).

6. The electrical connection device between the PCS and the distribution box in the energy storage cabinet according to claim 5, characterized in that: The distribution box (2) and the PSC (3) are located at the bottom layer of the energy storage cabinet (1).

7. The electrical connection device between the PCS and the distribution box in the energy storage cabinet according to claim 1 is characterized in that: The top of the energy storage cabinet (1) is provided with a lifting ring (11), and the bottom of the energy storage cabinet (1) is provided with a base frame (12).

8. The electrical connection device between the PCS and the distribution box in the energy storage cabinet according to claim 1 is characterized in that: The outer layers of the DC positive electrode row (4), the DC negative electrode row (5), the AC U row (6), the AC V row (7), the AC W row (8), and the AC N row (9) are respectively wrapped with insulating sleeves.

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